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Employee Benefit Plans - Restricted Stock Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Benefit Plans
Compensation cost	$ 14,400	$ 8,800	$ 7,400
Restricted stock
Employee Benefit Plans
Compensation cost	7,600	2,800	966
Unrecognized compensation cost	$ 41,500	$ 8,400	$ 3,900
Period for recognition	3 years
Shares
Unvested restricted stock, beginning balance (in shares)	4,608,560
Granted (in shares)	3,227,149
Vested (in shares)	(1,896,901)
Forfeited (in shares)	(64,166)
Unvested restricted stock, end balance (in shares)	5,874,642	4,608,560
Aggregate Intrinsic Value
Unvested restricted stock aggregate intrinsic value	$ 199,209
Restricted stock | Minimum
Employee Benefit Plans
Vesting period	1 year
Restricted stock | Maximum
Employee Benefit Plans
Vesting period	3 years

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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